Do you mean calcium chloride—or calcium hydroxide? The latter is used in lime-vinegar soaking solutions. See here.
As for calcium chloride, there are mixed reviews on this. See above also: Lime must be food grade—lime sold in lumberyards is industrial grade and may contain contaminants.
At least one cooperative extension advises against using lime in homemade pickles, as it may result in an "unsafe" product." Calcium chloride is used to firm commercial pickles and it was not used in this recipe.
You can read more here: http://learningstore.uwex.edu/assets/pdfs/b2267.pdf
We hope this helps.
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